#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

//int ADD(int x, int y)
//{
//	int z = x + y;
//	return z;
//}
//int main()
//{
//	int a = 10;
//	int b = 20;
//	int sum = ADD(a, b);
//	printf("%d", sum);
//	return 0;
//}
//int missingNumber(int* nums, int numsSize)
//{
//	int i = 0;
//	int tmp = 0;
//	for (i = 0; i < numsSize; i++)
//	{
//		tmp ^= ((*(nums + i)) ^ i);
//	}
//	tmp ^= numsSize;
//	return tmp;
//}
//int main()
//{
//	int nums[] = { 9,6,4,2,3,5,7,0,1 };
//	int numsSize = sizeof(nums) / sizeof(nums[0]);
//	int ret = missingNumber(nums, numsSize);
//	printf("%d", ret);
//	return 0;
//}

#include <stdio.h>
#include <math.h>
#include <windows.h>
#include <tchar.h>

float f(float x, float y, float z) {
	float a = x * x + 9.0f / 4.0f * y * y + z * z - 1;
	return a * a * a - x * x * z * z * z - 9.0f / 80.0f * y * y * z * z * z;
}

float h(float x, float z) {
	for (float y = 1.0f; y >= 0.0f; y -= 0.001f)
		if (f(x, y, z) <= 0.0f)
			return y;
	return 0.0f;
}

int main() {
	HANDLE o = GetStdHandle(STD_OUTPUT_HANDLE);
	_TCHAR buffer[25][80] = { _T(' ') };
	_TCHAR ramp[] = _T(".:-=+*#%@");

	for (float t = 0.0f;; t += 0.1f) {
		int sy = 0;
		float s = sinf(t);
		float a = s * s * s * s * 0.2f;
		for (float z = 1.3f; z > -1.2f; z -= 0.1f) {
			_TCHAR* p = &buffer[sy++][0];
			float tz = z * (1.2f - a);
			for (float x = -1.5f; x < 1.5f; x += 0.05f) {
				float tx = x * (1.2f + a);
				float v = f(tx, 0.0f, tz);
				if (v <= 0.0f) {
					float y0 = h(tx, tz);
					float ny = 0.01f;
					float nx = h(tx + ny, tz) - y0;
					float nz = h(tx, tz + ny) - y0;
					float nd = 1.0f / sqrtf(nx * nx + ny * ny + nz * nz);
					float d = (nx + ny - nz) * nd * 0.5f + 0.5f;
					*p++ = ramp[(int)(d * 5.0f)];
				}
				else
					*p++ = ' ';
			}
		}

		for (sy = 0; sy < 25; sy++) {
			COORD coord = { 0, sy };
			SetConsoleCursorPosition(o, coord);
			WriteConsole(o, buffer[sy], 79, NULL, 0);
		}
		Sleep(33);
	}
}